US4854197A - Torque wrenches - Google Patents

Torque wrenches Download PDF

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Publication number
US4854197A
US4854197A US07/145,915 US14591588A US4854197A US 4854197 A US4854197 A US 4854197A US 14591588 A US14591588 A US 14591588A US 4854197 A US4854197 A US 4854197A
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US
United States
Prior art keywords
ratchet
torque wrench
drive lever
ratchet wheel
piston rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/145,915
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English (en)
Inventor
John N. Walton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hedley Purvis Ltd
Original Assignee
Hedley Purvis Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hedley Purvis Ltd filed Critical Hedley Purvis Ltd
Assigned to HEDLEY PURVIS LIMITED reassignment HEDLEY PURVIS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WALTON, JOHN N.
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Publication of US4854197A publication Critical patent/US4854197A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/46—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle
    • B25B13/461—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member
    • B25B13/462—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston

Definitions

  • This invention relates to torque wrenches used for rotating mechanical components, e.g. for tightening or loosening nuts, bolts and screws.
  • these wrenches use a wrench head, for example a removable standard socket spanner, carried by holding means on the wrench, normally a shaft mounted rotatably in a housing.
  • a wrench head for example a removable standard socket spanner
  • holding means on the wrench normally a shaft mounted rotatably in a housing.
  • special sockets may be used, these sockets having a polygonal bore for the nut or other polygonal head to be rotated by the wrench and a shaft which fits into a hole in the wrench, this hole then constituting the holding means for the socket.
  • At least one drive lever extending radially from and pivotable coaxially with the said holding means is connected to it by a ratchet, and a piston rod of a reciprocating fluid piston cylinder arrangement is pivotally connected to the drive lever or levers at a location radially spaced from the said holding means, to oscillate the lever and thus drive the said holding means in rotation through the ratchet.
  • U.S. Pat. No. 4,027,561 shows a torque wrench of this kind in which the hydraulic cylinder is pivoted at the end remote from the drive levers to accommodate the arcuate movement of the end of the piston rod remote from the cylinder, the piston rod itself reciprocating on the axis of the cylinder.
  • the cylinder bore is formed in the housing of the wrench so that the cylinder has a fixed axis and the piston rod is swivelably mounted in the piston, again so as to accommodate the movement of the far end of the piston rod in an arc round the shaft axis.
  • An object of the present invention is to provide a hydraulic torque wrench which will exercise a substantially constant torque, while ensuring the minimum of wear at the connection between the end of the piston rod and the drive lever or levers, and avoidance of unnecessary bending stresses on the piston rod.
  • the curve may be such that the aforesaid distance, i.e. the length of the perpendicular from the said holding means to the line of movement of the piston rod, is at a minimum at the point where friction due to movement of the mechanism is a minimum.
  • a torque wrench according to the invention can be readily so constructed that the drive lever and ratchet mechanism can be removed from the device by taking out a drive shaft, and we further provide a ratchet link which can be utilised with wrenches where the drive lever and ratchet mechanism can be so removed.
  • Such a ratchet link comprises a member forming a lever of which one end is constructed to cooperate with and be moved by the piston rod of the fluid piston-cylinder arrangement of the wrench and the other end forms a housing for a ratchet wheel having a ratchet connection between the wheel and the said member, the said member having a bore between its ends to fit a drive shaft of the torque wrench or another shaft replacing the said drive shaft, and the ratchet wheel being constructed to fit over a nut so as to rotate the same.
  • a ratchet link so constructed can be used to tighten or loosen nuts which are situated so close to an obstruction in the axial direction of the nut that access is not available for a tool utilising standard sockets.
  • ratchets have usually comprised a pawl on the drive lever which abuts the teeth of a ratchet wheel mounted coaxially on the means for holding the socket.
  • the pawl is replaced by one or more rollers, but not more than three such rollers, which float between grooves in the ratchet wheel and a socket or sockets in the drive lever.
  • roller or rollers When the drive lever is executing a driving stroke the roller or rollers are located in the grooves on the ratchet wheel and are propelled by shoulders on the drive lever whereas, when the drive lever is on its return stroke, the roller or rollers move back into the socket or sockets in the drive lever.
  • a spring may be provided for each roller to urge it towards the ratchet wheel.
  • ratchet of the present invention is utilisable in the torque wrench or in the ratchet link.
  • FIG. 1 is an end view of one form of torque wrench according to the invention
  • FIG. 2 is a section on the line II--II in FIG. 1;
  • FIG. 3 is a part section on the line III--III in FIG. 2;
  • FIG. 4 shows a modification of the cylinder arrangement
  • FIG. 5 is a longitudinal section through another embodiment, taken on the line V--V in FIG. 6;
  • FIG. 6 is a section on the line VI--VI in FIG. 5;
  • FIG. 7 is a view in the direction of the arrow ⁇ A ⁇ in FIG. 6 with the cover plate removed;
  • FIG. 8 shows a modification of the cylinder mounting
  • FIG 9 illustrates a situation where a conventional torque wrench cannot be used
  • FIG. 10 is a side view, partly sectioned, of a torque wrench as illustrated in any one of FIGS. 1 to 8, in which the drive lever and ratchet mechanism have been removed and replaced by one embodiment of ratchet link according to the invention, and a roller attachment has been added;
  • FIG. 11 is an end view of FIG. 10
  • FIG. 12 is a view similar to FIG. 2 but showing a straight configuration for the guide channel.
  • the torque wrench comprises a housing 10 in which a square shaft 12 is mounted for rotation by means of support bearings 13 in the housing 10.
  • This shaft can be fitted with a removable standard socket spanner appropriate for the nut or bolt head to be turned by the device.
  • the shaft 12 carries a ratchet wheel 14 driven in a counterclockwise direction (as viewed in FIG. 2) by a drive lever 18 which surrounds the ratchet wheel 14.
  • the ends 16 of the ratchet wheel 14 have a smaller diameter than the centre portion, and similarly the sides 20 of the drive lever 18 extend inwardly to a greater extent than the centre part so as to be journalled on the ends 16 of the ratchet wheel 14.
  • the sides 20 also form flanges constituting end stops for rollers 22 which constitute the driving connection between the drive lever 18 and ratchet wheel 14, replacing the pawl which is the usual driving connection to a ratchet wheel.
  • the drive lever is made in two halves, as shown in FIG. 3, to enable it to be fitted over the ratchet wheel 14, the two halves of the drive lever being rigidly connected together after assembly by screws (not shown).
  • the rollers 22 float between grooves 24 found in the outer circumference of the ratchet wheel 14 and sockets 28 in the drive lever 18.
  • each roller 22 lies between a shoe 30 located in a shoulder of the drive lever 18 and the forward end 25 of a groove 24.
  • the rollers 22 each run back up the rear end 26 of the groove 24 in which it is located and move into one of the sockets 28 in the drive lever 18.
  • Springs 32 anchored to the drive lever 18 bias the roller 22 towards the ratchet wheel 14, so that they slip into the grooves 24 at the beginning of the next driving stroke of the drive lever 18.
  • a holding pawl 34 pivoted to the housing 10 at 35 has the free end 36 shaped as a part-cylinder of the same diameter as that of the rollers 22.
  • the holding pawl is biased towards the ratchet wheel 14 by a leaf spring 37, and prevents any substantial rearward movement of the ratchet wheel.
  • Power for the torque wrench is provided by a hydraulic cylinder 40 and double-acting piston 42, hydraulic fluid being fed and exhausted through ports 48, 50 according to the direction of movement of the piston 42.
  • the piston 42 At one end the piston 42 has a head 44, which fits in the bore of the cylinder through a suitable packing such as an O-ring 45, and is provided with a cap 46 screwed into the piston head 44.
  • the cylindrical body of the piston 42 passes through a gland 52 in the open end of the cylinder, this gland being sealed to the cylinder; a packing 54 between the gland 52 and the piston 42 forms a seal against hydraulic fluid at this point.
  • the piston 42 is hollow to accommodate a piston rod 56.
  • the piston rod 56 has a head 58 located between the piston cap 46 and a shoulder 60 in the piston head 44.
  • the end face of the head 58 and the adjacent face of the cap 46 are spherical in shape to allow for some degree of pivoting of the piston rod 56 in all directions.
  • the other end of the piston rod has been cut away in FIG. 2, but is the same as shown in FIG. 4, being also illustrated in section in FIG. 3.
  • the piston rod has a head 62 bored to take a pin 64 through a spherical bearing 66.
  • the pin 64 is journalled in two drive shoes 68, one each side of the piston rod head 62, and is mounted at each end in a support shoe 70 through spherical bearings 72.
  • the support shoes 70 can move along guide channels 74, each formed in the housing 10 or in a member secured to the housing.
  • the guide channels are in any event stationary in relation to the housing.
  • the drive lever 18 At its upper end (in the position seen in FIG. 2) the drive lever 18 is bifurcated to leave upstanding ears 76,76 and 77,77, the head 62 of the piston rod 56 passing between the ears 76. Also at its upper end the drive lever 18 is formed with a parallel sided recess which is divided centrally by the ears 76 to provide a slot 78, one on each side, to form guideways for the drive shoes 68.
  • head 62 of the piston rod is guided by the pin 64, the movement of which is controlled by the shape of the guide channels 74.
  • the guide channels 74 could be straight, as shown in FIG. 12 in which case, ignoring the effect of friction, there would be a constant torque system, the movement of torque being calculated as the force exerted by the piston multiplied by the length of the normal from the centre of the ratchet wheel 14 to the straight axis of movement of the piston rod 56.
  • both the piston 42 and piston rod 56 are allowed a degree of rotational movement.
  • the piston rod 56 passes through a gland 80 with a normal seal 82 against egress of hydraulic fluid.
  • the gland 80 is held in place between a shoulder 84 and a support ring 86, which is firmly attached to the inside of the cylinder 40, and which is bored centrally so that the piston rod 56 can pass through with sufficient clearance to allow pivotal movement of the piston rod.
  • a face seal 87 prevents passage of fluid between the gland 80 and the support ring 86.
  • the diameter of the gland 80 is less than that of the part of the cylinder 40 in which it is located, and it can therefore move laterally as the piston rod 56 swings out of the line of the axis of the cylinder.
  • FIGS. 5 to 7 The mode of operation of the embodiment shown in FIGS. 5 to 7 is similar to that of FIGS. 1 to 3, and only the differences in design need be explained.
  • the front end of the cylinder 40 has a part spherical surface 90 which abuts a complementarily shaped bearing 92, being held there by a part spherical thrust bearing 96 which abuts a complementarily shaped shoulder 94 on the cylinder, the thrust bearing 96 being held in place by a thrust collar 98.
  • the piston rod 56 always moves along the axis of the cylinder 40 and it is the cylinder which rotates as necessary according to the movement of the head 62 of the piston rod, sufficient space being allowed for this between the cylinder 40 and the thrust bearing 96 and thrust collar 98.
  • the holding pawl 34 does not operate on the ratchet wheel 14 but on a similarly shaped wheel 100 fixed on the drive shaft 12 beside the ratchet wheel 14.
  • the wheel 100 is journalled in the housing 10 at 102 and in effect acts also as a support bearing for the shaft 12 opposite the support bearing 13.
  • a release lever 99 allows the holding pawl 34 to be disengaged when this is desired.
  • the holding pawl 34 and the grooves in the wheel are protected by a cover plate 104.
  • FIG. 8 shows a different cylinder mounting.
  • the cylinder 40 is mounted with projections 106 on each side journalled in bearings 108 in the housing 10 so that the cylinder 40 can move at right angles to the plane of the figure, i.e. in the plane of FIG. 5. Otherwise the modification is the same as that of FIGS. 5 to 7.
  • the drive shaft 12 can be pushed through from one side to the other so that nuts and bolts may be both tightened and unscrewed.
  • the end of the casing 10 which lies adjacent the hydraulic cylinder 40 is provided with ears 110 leading to a flat lower surface 112, a construction which allows ancillary fitments to be slid onto the housing.
  • ancillary fitment can be a laterally extending plate as referred to above.
  • FIGS. 1 to 8 The design of torque wrench which we have described and illustrated in FIGS. 1 to 8 has allowed us to evolve a useful accessory in the form of a ratchet link for specialised flange use in those cases where the conventional torque wrench cannot be employed.
  • FIG. 9 An example of such a case is shown in FIG. 9 which illustrates two sections of pipe 114, each having a circular flange 116 at the end connected through a threaded bolt and nuts 118. Cladded insulation 119 prevents the torque wrench and socket spanner being used and another tool must be employed.
  • Specialised hydraulic tools have been evolved for this purpose, and it is also known to adapt normal hydraulic wrenches by fitting a roller attachment and a torque link.
  • the ratchet mechanism built into the machine cannot be used and as a result the tool has to be manually repositioned after each forward stroke of the piston, which is time consuming and tiring for the operator.
  • a ratchet link which can be utilized with a hydraulic wrench which is so constructed that the drive lever and ratchet mechanism can be removed from the device by taking out the drive shaft. It can readily be seen from the above description that this applies to the torque wrench illustrated in FIGS. 1 to 8.
  • FIG. 10 designates the housing of any of the torque wrenches described by reference to FIGS. 1 to 8.
  • the drive lever 18 and the ratchet wheel 14, together with the parts thereon have been removed as a unit after withdrawing the drive shaft 12 and this unit has been replaced by the ratchet link generally designated at 120, this being held in place by reinserting the drive shaft 12 in its normal position in the torque wrench, but on this occasion passing it also through the hole 122, thus retaining the upper part of the ratchet link 120 between the sides of the housing 10.
  • the upper end of the ratchet link 120 (in the position seen in the drawings) fits over the drive shoes 68, being formed with upstanding ears 76,77 for this purpose. It can be seen that the body 124 of the ratchet link 120 acts as a lever which pivots round the drive shaft 12.
  • the body 124 of the ratchet link 120 forms a housing 126 for a ratchet wheel 128, the connection between the ratchet wheel and the body 124 being a roller 22 which floats between grooves 24 in the ratchet wheel and a socket 28 in the body 124 in the same manner as is noted above in reference to FIG. 5.
  • a spring 32 exercises the same function as the spring 32 in FIG. 5.
  • roller attachment The end of the housing 10 adjacent the cylinder is fitted with a roller or pad attachment, a roller attachment being shown in FIGS. 10 and 11.
  • This comprises a sleeve 142 which can be slid over the ears 110 of the torque wrench.
  • Depending members 144 attached to the sleeve 142 are bored to receive an axle 146 carrying the rollers 148.
  • the ratchet wheel 128 is suitably bored to accommodate nuts of the correct size to be tightened or loosened.
  • the piston rod 56 is reciprocated in the usual way. Forward movement of the piston rod causes the ratchet link 120 to pivot round the drive shaft 12 and the roller 22 to engage with a groove 24 in the ratchet wheel, thus turning the nut. On the return stroke of the piston rod 56 the drive roller 22 moves into the socket 28 and thus into an adjacent groove 24 on the ratchet wheel 128.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Ceramic Products (AREA)
  • Glass Compositions (AREA)
  • Pulleys (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Actuator (AREA)
  • Transmission Devices (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Drilling Tools (AREA)
US07/145,915 1987-01-20 1988-01-20 Torque wrenches Expired - Fee Related US4854197A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8701194 1987-01-20
GB878701194A GB8701194D0 (en) 1987-01-20 1987-01-20 Torque wrenches

Publications (1)

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US4854197A true US4854197A (en) 1989-08-08

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US (1) US4854197A (zh)
EP (1) EP0276936B1 (zh)
CN (1) CN1012484B (zh)
AT (1) ATE61755T1 (zh)
AU (1) AU602552B2 (zh)
CA (1) CA1289392C (zh)
DE (1) DE3862033D1 (zh)
ES (1) ES2021829B3 (zh)
GB (1) GB8701194D0 (zh)
IN (1) IN170429B (zh)
NO (1) NO166477C (zh)
NZ (1) NZ223213A (zh)
SG (1) SG36593G (zh)
ZA (1) ZA88251B (zh)

Cited By (16)

* Cited by examiner, † Cited by third party
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WO1992005917A1 (en) * 1990-10-08 1992-04-16 Junkers John K Fluid-operated wrench
US5140874A (en) * 1990-10-08 1992-08-25 Junkers John K Fluid-operated wrench
US5263388A (en) * 1991-04-10 1993-11-23 Paul-Heinz Wagner Power wrench
US5515753A (en) * 1993-09-10 1996-05-14 Paul-Heinz Wagner Power wrench
US5784934A (en) * 1997-01-30 1998-07-28 Shinano Pneumatic Industries, Inc. Ratchet wrench with pivotable head
US5823075A (en) * 1993-10-25 1998-10-20 Torrekens; Daniel Octaaf Ghislain Tightening spanner
US6311583B1 (en) 2000-04-13 2001-11-06 S. P. Air Kabusiki Kaisha Ratchet wrench with pivotable head
US20030201177A1 (en) * 1996-11-15 2003-10-30 Alastair Hodges Hemoglobin sensor
KR20040015442A (ko) * 2002-08-13 2004-02-19 현대모비스 주식회사 볼트 체결용 이중 소켓 렌치
US20050034567A1 (en) * 2003-08-13 2005-02-17 Airbus France Screwed device tightening/untightening tool
US20070084310A1 (en) * 2005-10-14 2007-04-19 Sp Air Kabushiki Kaisha Air ratchet tool with rotatable head
US20070141967A1 (en) * 2005-10-14 2007-06-21 Sp Air Kabushiki Kaisha Die Grinder with Rotatable Head
US20080060482A1 (en) * 2006-09-12 2008-03-13 Peter Koppenhoefer Torque tool for tightening or loosening connections, and method of tightening or loosening the same
US20150298301A1 (en) * 2014-04-22 2015-10-22 John D. Davis Compact Hydraulic Torque Wrench Cartridge
US20160311089A1 (en) * 2015-04-22 2016-10-27 John D. Davis Hydraulic Torque Wrench with Stacked Drive Plate Cartridge, Multiple Cartridge Pawls and Snap-in Retract Lock
US11318592B2 (en) * 2016-11-14 2022-05-03 Spx Flow Technology England Limited Hydraulic torque wrench

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8902659D0 (en) * 1989-02-07 1989-03-30 Hedley Purvis Ltd Improved hydraulic torque wrench
US5305670A (en) * 1989-07-28 1994-04-26 Gregory Fossella Adjustable wrench
DE4111631A1 (de) * 1991-04-10 1992-10-15 Wagner Paul Heinz Kraftschrauber
GB9202776D0 (en) * 1992-02-10 1992-03-25 Hedley Purvis Ltd Hydraulic torque wrench
DE9405697U1 (de) * 1993-05-06 1994-07-14 Wagner Paul Heinz Kraftschrauber
CN102528710B (zh) * 2010-12-30 2015-12-16 洪涛 可连续作业的空间楔合式扭转作业工具
CN103692148B (zh) * 2013-12-11 2016-08-17 上海瑞纽机械股份有限公司 螺母破切器
CN105217509B (zh) * 2015-09-28 2018-11-02 浙锚科技股份有限公司 螺纹钢用张拉千斤顶
CN105269503A (zh) * 2015-11-26 2016-01-27 申益 一种同心轴反力臂液压扭矩扳手
CN105652394B (zh) * 2016-03-25 2018-03-13 山东华光光电子股份有限公司 一种激光器同轴耦合压光力度控制装置
CN111148602B (zh) * 2017-08-16 2022-08-23 凯特克分部尤尼克斯公司 用于拧紧螺纹紧固件的装置
CN109944976B (zh) * 2019-04-03 2020-01-17 哈尔滨工程大学 一种可调整位姿的多功能rov用扭矩扳手
CN109968255B (zh) * 2019-04-04 2020-12-22 宁波工程学院 一种窄距双螺母定力矩同步预紧扳手
CN111002261B (zh) * 2019-12-27 2021-04-23 南京涵曦月自动化科技有限公司 一种预置式双向电动扭力扳手
CN112296919B (zh) * 2020-10-20 2022-07-08 长江大学 一种圆柱滚子式液压扭矩扳手

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GB244777A (en) * 1924-12-16 1926-03-11 Otto Gottfried Wellton Improvements in ratchet mechanism
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FR1035176A (fr) * 1951-04-06 1953-08-18 Perfectionnements aux clés à cliquet
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GB1243927A (en) * 1969-07-18 1971-08-25 John Louis Biach Torque applying device
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US4336727A (en) * 1980-02-28 1982-06-29 Junkers John K Hydraulic wrench for limited space application
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US4524651A (en) * 1981-04-03 1985-06-25 Paul-Heinz Wagner Power wrench
US4669338A (en) * 1985-10-11 1987-06-02 Collins Bobby W Ratcheting box wrench
US4674368A (en) * 1985-06-14 1987-06-23 Raymond Engineering Inc. Ratchet mechanism for hydraulic wrench
US4706527A (en) * 1984-10-22 1987-11-17 Junkers John K Fluid operated wrench for tightening or loosening a threaded connector
US4744271A (en) * 1985-10-11 1988-05-17 Collins Bobby W Ratcheting box wrench

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FR2332106A1 (fr) * 1975-11-19 1977-06-17 Junkers John Cle hydraulique
SU1049243A1 (ru) * 1982-01-07 1983-10-23 Государственный Институт По Проектированию Технологии Монтажа Предприятий Химической Промышленности Ключ дл сборки крупных резьбовых соединений
JPS61100377A (ja) * 1984-10-22 1986-05-19 ジヨン　ケイ　ユンカ−ス 流体圧レンチ

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB244777A (en) * 1924-12-16 1926-03-11 Otto Gottfried Wellton Improvements in ratchet mechanism
US2482387A (en) * 1947-08-05 1949-09-20 Orville D Veneman Gear-operated double-socket wrench
FR1035176A (fr) * 1951-04-06 1953-08-18 Perfectionnements aux clés à cliquet
US3438451A (en) * 1967-06-05 1969-04-15 Ingersoll Rand Co Power wrench
GB1243927A (en) * 1969-07-18 1971-08-25 John Louis Biach Torque applying device
US3620105A (en) * 1969-11-07 1971-11-16 Hi Shear Corp Offset driver for threaded fasteners
US4027561A (en) * 1975-11-19 1977-06-07 Junkers John K Hydraulic wrench
DE2626923A1 (de) * 1976-06-16 1977-12-29 Mock Geraetebau Gmbh & Co Kg Vorrichtung zum anziehen und loesen von schraube-mutter-verbindungen
GB1584068A (en) * 1976-10-19 1981-02-04 Junkers J Hydraulic wrench
US4201099A (en) * 1978-08-14 1980-05-06 Junkers John K Hydraulic wrench
US4201099B1 (en) * 1978-08-14 1993-12-07 K. Junkers John Hydraulic wrench
DE2914707A1 (de) * 1979-04-11 1980-10-23 Wagner Maschf Paul Heinz Schraubwerkzeug mit ruecklaufsperre
US4275620A (en) * 1979-05-21 1981-06-30 Collins Bobby W V Torque arm for use with a torque wrench
US4346630A (en) * 1979-12-17 1982-08-31 Rodac Pneumatic Tools Ratchet wrench
US4336727A (en) * 1980-02-28 1982-06-29 Junkers John K Hydraulic wrench for limited space application
US4339968A (en) * 1980-07-21 1982-07-20 Willard Krieger Hydraulic torque multiplier wrench
US4524651A (en) * 1981-04-03 1985-06-25 Paul-Heinz Wagner Power wrench
US4706527A (en) * 1984-10-22 1987-11-17 Junkers John K Fluid operated wrench for tightening or loosening a threaded connector
US4674368A (en) * 1985-06-14 1987-06-23 Raymond Engineering Inc. Ratchet mechanism for hydraulic wrench
US4669338A (en) * 1985-10-11 1987-06-02 Collins Bobby W Ratcheting box wrench
US4744271A (en) * 1985-10-11 1988-05-17 Collins Bobby W Ratcheting box wrench

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992005917A1 (en) * 1990-10-08 1992-04-16 Junkers John K Fluid-operated wrench
US5140874A (en) * 1990-10-08 1992-08-25 Junkers John K Fluid-operated wrench
US5263388A (en) * 1991-04-10 1993-11-23 Paul-Heinz Wagner Power wrench
US5515753A (en) * 1993-09-10 1996-05-14 Paul-Heinz Wagner Power wrench
US5823075A (en) * 1993-10-25 1998-10-20 Torrekens; Daniel Octaaf Ghislain Tightening spanner
US20030201177A1 (en) * 1996-11-15 2003-10-30 Alastair Hodges Hemoglobin sensor
US5784934A (en) * 1997-01-30 1998-07-28 Shinano Pneumatic Industries, Inc. Ratchet wrench with pivotable head
US6311583B1 (en) 2000-04-13 2001-11-06 S. P. Air Kabusiki Kaisha Ratchet wrench with pivotable head
KR20040015442A (ko) * 2002-08-13 2004-02-19 현대모비스 주식회사 볼트 체결용 이중 소켓 렌치
US7117764B2 (en) * 2003-08-13 2006-10-10 Airbus France Screwed device tightening/untightening tool
US20050034567A1 (en) * 2003-08-13 2005-02-17 Airbus France Screwed device tightening/untightening tool
US20070084310A1 (en) * 2005-10-14 2007-04-19 Sp Air Kabushiki Kaisha Air ratchet tool with rotatable head
US20070141967A1 (en) * 2005-10-14 2007-06-21 Sp Air Kabushiki Kaisha Die Grinder with Rotatable Head
US8480453B2 (en) 2005-10-14 2013-07-09 Sp Air Kabushiki Kaisha Die grinder with rotatable head
US20080060482A1 (en) * 2006-09-12 2008-03-13 Peter Koppenhoefer Torque tool for tightening or loosening connections, and method of tightening or loosening the same
US7497147B2 (en) * 2006-09-12 2009-03-03 Unex Corporation Torque tool for tightening or loosening connections, and method of tightening or loosening the same
US20150298301A1 (en) * 2014-04-22 2015-10-22 John D. Davis Compact Hydraulic Torque Wrench Cartridge
US9550282B2 (en) * 2014-04-22 2017-01-24 John D. Davis Compact hydraulic torque wrench cartridge
US20160311089A1 (en) * 2015-04-22 2016-10-27 John D. Davis Hydraulic Torque Wrench with Stacked Drive Plate Cartridge, Multiple Cartridge Pawls and Snap-in Retract Lock
US11318592B2 (en) * 2016-11-14 2022-05-03 Spx Flow Technology England Limited Hydraulic torque wrench

Also Published As

Publication number Publication date
ATE61755T1 (de) 1991-04-15
CA1289392C (en) 1991-09-24
NO166477B (no) 1991-04-22
IN170429B (zh) 1992-03-21
CN88100320A (zh) 1988-08-03
NO880204D0 (no) 1988-01-19
EP0276936B1 (en) 1991-03-20
SG36593G (en) 1993-06-11
NO166477C (no) 1991-07-31
CN1012484B (zh) 1991-05-01
ES2021829B3 (es) 1991-11-16
AU602552B2 (en) 1990-10-18
NZ223213A (en) 1989-05-29
EP0276936A1 (en) 1988-08-03
AU1028188A (en) 1988-07-21
NO880204L (no) 1988-07-21
ZA88251B (en) 1989-09-27
DE3862033D1 (de) 1991-04-25
GB8701194D0 (en) 1987-02-25

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